 *{padding:0;margin: 0;}
 .px2rem(@name, @px) {
   @{name}: @px / 75 * 1rem;
}
.ml(@top){.px2rem(margin-left, @top);}
header{
	.px2rem(height,1190);
	background: ffffff;
}
.img{
	.ml(100);
	.px2rem(width,540);
	.px2rem(height,102);
}